Spool for photographic films



Jan. 3, 1933- T. G. BAXENDEN ET AL 1,892,717

SPOOL FOR PHOTOGRAPHIC FILMS Filed 06. 20, 1950 INVENTORS T. [LE1 ARENJJEINI' 3! L] R .C n LLYEAR ATTORNEY Patented Jan. 3, 1933 UNITED STATES THOMAS GEORGE BAXENDEN, OF WATFORD, AND JOHN ROBERT COLLYEAE, OF BUSHE'Y,

PATENT OFFICE ENGLAND SPOOL FOR PHOTOGRAPHIC FILMS Application filed October 20, 1930, Serial No.

This invention relates to spools such as are used in roll-film cameras and more particu larly to spools of this type which are made from sheet metal.

In spools of this type, the body of the spool is constructed from a rolled-up blank, which is out so as to provide a pair of longitudinal slots which will be diametrically opposite one another in the finished body.

1?; These slots receive the tapered end of the with lipped edges which form a guide for the end of the paper, but the provision of this guide does not completely remove the difficulty of inserting the end of the paper strip through the shorter slot from the inside of the spool, as is necessary when the free end has already been inserted through the longer slot.

The object of the present invention is to overcome this difficulty and also to assist in providing a strong, rigid construction which is necessary in this type of spool.

According to the invention we provide, on either side of the shorter slot in the spool body, an impressed, longitudinal rib or corrugation which extends substantially the length of the body. These ribs are formed as close to the longer edges of the slot as is practicable and it will be clear that, due to the fact that they are formed by pressingthe metal of the body inwards towards the interior thereof, they form a pair of internal guides which assist in directing the end of the paper strip through the slot and, at the same time, greatly strengthen the body against longitudinal stresses.

A construction according to the invention is illustrated in the accompanying drawing, wherein Fig. 1 is an elevation of a spool, while Fig. 2 is a cross section thereof.

The spool comprises a body 1 which is {189,960, and in Great Britain July 28, 1930.

formed from a rolled up, sheet metal blank and hence has a hollow interior, and is provided with end discs 2 which are retained in position by any suitable means such as pressing or welding. The body has two diametrically opposite, longitudinal slots 3 and 4, the longer slot?) being provided with the usual inturned edges which form a guide for the free end of the paper strip covering the film. The shorter slot 4, has on either side thereof, and as close to its edge as is practicable, an impressed, longitudinal rib or corrugation 5. These ribs extend substantially the whole length of the body 1 and form an internal guide for assisting the end of the paper strip through the shorter slot 4 from the inside and prevent it from curling round inside the hollow body of the spool. The ribs also help to strengthen the body and ensure that the body is as rigid as possible.

What we claim as our invention and desire to secure by Letters Patent is In a spool for photographic films, a cylindrical sheet metal body portion, a disc mounted on each end of the body portion, said body portion having a pair of diametrically opposed longitudinal slots of unequal length, the longer slot having inturned edges forming a guide, and a longitudinal rib formed in said body adjacent both edges of the shorter slot for a purpose specified.

THOMAS GEORGE BAXENDEN. JOHN ROBERT COLLYEAR. 

